Daewoo DSC-34W70N Service Manual
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Daewoo DSC-34W70N Service Manual

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Service Manual

Release 1
HDTV Monitor
Chassis : SC-120
Model : DSC-34W70N
Specification
Power Requirement
Power Consumption
Dimensions(W/H/D)
General
Weight
Antenna
Screen Size
Display Format
Picture
Horizontal Resolution
Sound System
NTSC Audio
Sound
Audio Power
Rear
RF Antenna Input
NTSC A/V In
NTSC A/V Monitor Out
Inputs/
HD Component In
Output
DVD Component In
Surround Channel Out
Sub woofer Out
Side
NTSC A/V In
Headphone
DAEWOO ELECTRONICS CO., LTD.
http : // svc.dwe.co.kr
S/M No. : DSC120BEF0
AC 120V, 60Hz
210watts
41"W x 26.2"H x 24.6"D
81Kg (178.61bs)
One 75ohm external input terminal for
UHF/VHF/Cable
34"(diagonal), 16:9 Aspect Ratio
DTV : 1080I @ 33.75KHz
NTSC/DVD : 480p @ 31.5KHz
800 Lines
Dolby Pro Logic
Multi CH TV Stereo(MTS) /
Second Audio Program(SAP)
8W/ch (Main L/R), 5W/ch (Center)
2each (Video/L/R)
1each (S-Video/Video/L/R)
1each (Video/L/R)
1each (Y/Pb/Pr)
1each (Y/Cb/Cr)
1each (SL/SR)
1each
1each (S-Video/Video/L/R)
1each (L/R)
Nov. 2001

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Summary of Contents for Daewoo DSC-34W70N

  • Page 1: Service Manual

    S/M No. : DSC120BEF0 Service Manual Release 1 HDTV Monitor Chassis : SC-120 Model : DSC-34W70N Specification Power Requirement AC 120V, 60Hz Power Consumption 210watts Dimensions(W/H/D) 41”W x 26.2”H x 24.6”D General Weight 81Kg (178.61bs) Antenna One 75ohm external input terminal for...

  • Page 2: Table Of Contents

     Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). 1. Product Safety 2.

  • Page 3: Product Safety

    PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS CAUTION : Do not attempt to modify this product in any way. GRAPHIC SYMBOLS : Unau-thorized modifications will not only void the warranty, but The lightning flash with arrowhead symbol, may lead to your being liable for any resulting property damage within an equilateral triangle, is intended to or user injury.
  • Page 4 SUBJECT : IMPLOSION 4. Wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting 1. All direct viewed picture tubes are equipped with an instructions. A receiver mounted to a shelf or platform integral Implosion protection system, but care should be must retain its original feet(or the equivalent thickness in taken to avoid damage during installation.

  • Page 5: Specifications

    2. Specification Power Requirement AC 120V, 60Hz Power Consumption 210watts General Dimensions(W/H/D) 41”W x 26.2”H x 24.6”D Weight 81Kg (178.61bs) Antenna One 75ohm external input terminal for UHF/VHF/Cable Screen Size 34”(diagonal), 16:9 Aspect Ratio Picture Display Format DTV : 1080I @ 33.75KHz NTSC/DVD : 480p @ 31.5KHz Horizontal Resolution 800 Lines...

  • Page 6: Remote Control Overview

    3. Remote control overview The remote control has the following functions: Power button Press to turn the HDTV Monitor (and other equipment) on and off DTV button Press this button repeatedly to display HD Component Video. TV/VIDEO button Press to view components you have connected to the HDTV Monitor. Press this button repeatedly to display: *TV mode *Video1...

  • Page 7: Limited Warranty

    4. Limited Warranty Daewoo Electronics Corporation of America Inc. (also known as DECA) warrants this product to be free from defects in material and workmanship and agrees to remedy any such defect. This warranty covers 3 years labor and 3 years parts from the date of original purchase.
  • Page 8 5. Service Modes 1. Entering to Service Mode With the service remote control S1 : Heat Run S2 : Screen Voltage S3 : Sound Controls S4 : Video Controls S5 : Picture Quality S6 : Geometry S7 : PIP S12 : Factory Setting S8 : White Balance S9 : Sub Picture &...
  • Page 9 Service Modes 6) S6 : Geometry Adjustment mode NTSC/DVD After receiving Air or external video, adjust geometry. HDUTY H Duty TRAPE Trapezoid SPINS Side Pin S HPOSI H Position FOCUSPH H Focus Phase SPINW Side Pin W FOCUSPA H Focus Amplitude SPIN Pincusion MOIRE...

  • Page 10: Service Mode

    Service Modes 10) S10 : Option Adjustment mode Caption English Fixed CALMP Don’t adjust OSD POS The horizontal position of Caption OSD available EPOS V POS The Vertical position of Caption OSD available POTION America / Korea Fixed PC INPUT Fixed CIP-CT The horizontal PLL speed of Video Process IC (VPC3230)

  • Page 11: General Adjustment

    6. General Adjustment In the majority of cases, a high definition digital television will need basic adjustments such as high voltage, screen voltage, focus, white balance, sub brightness, and geometry. All adjustments should be performed after heat-running the set for at least 20 minutes. 1.
  • Page 12 General Adjustment Sub Brightness Adjustment 1. Tune on RETMA Pattern. 2. Press S9 button. 3. The following OSD menu will appear on the screen, and the data are initial values before adjusting. SUB-CONT SUB-BRIG SUB-SHP SUB-COR SUB-TINT PRE-FM PRE-SCART PRE-SCART1 NOR HP DTV HP STEREO ID...
  • Page 13 General Adjustment Geometry 1. To adjust V-Position, H-Size, H-Position and so forth, tune on RETMA Pattern. 2. To adjust Pincushion, Trapezoid and so forth, tune on Cross Hatch signal. 3. Screen Mode should be on 16:9 mode, and the Video Mode should be on Normal mode. 4.
  • Page 14 General Adjustment Item Screen Image Adjustmant Procedure 1) Receive NTSC RETMA signal. 2) The Screen mode should be selected on 16:9 V S Linearity mode. 3) When the center area of RETMA signal’s circle is S type in the vertical direction, adjust VS Linearity so that vertical interval may be the same.
  • Page 15 General Adjustment Item Screen Image Adjustmant Procedure 1) Receive NTSC Cross Hatch signal. 2) The Screen mode should be selected on 16:9 mode. Trapezoid 3) When the screen shape is not rectangular but trapezoid, adjust Trapezoid to correct the unbalanced shape. 1) There is no need to adjust.

  • Page 16: Special Adjustment (When Replacing New Circuits Boards)

    7. Special Adjustment (When replacing new circuit boards) 1. Power assembly 1) After replacing a new assembly, X Radiation Protection Circuit Test When service has been performed on the horizontal deflection system, high voltage system or B+ system, the X-Radiation Protection Circuit Test must be tested for proper operation as follows: 1-1) Operate the HDTV Monitor for at least 20 minutes.

  • Page 17: Troubleshooting Charts

    8. Troubleshooting charts No Picture (NTSC Signal) OSD is on the screen. AV Signal RF Signal Check video signal of IA1. Check TV video signal of IA1. Check Tuner Video1 :CVBS to #43, Y to #45, CVBS of main tuner (TU01) : #41 (TU01 &...
  • Page 18 Troubleshooting charts No Sound (NTSC Signal) AV Signal RF Signal Check audio signal of IA1. Check the audio base-band signal to SIF of TU01. Video1 : L to #44, R to #46 Video2 : L to #2, R to #4 Video3 : L to #8, R to #10 Check audio signal of UC102.
  • Page 19 Troubleshooting charts No Raster I701 communicates with I402 on the IIC bus. Check the #3 (SDA) and #4 (SCL) of I402. Check I701 Vertical and I402. 5Vp-p Deflection Check #17 (H-Drive output) of I402. 0.7Vp-p 31.5KHz (NTSC/DVD) 33.75KHz (DTV) Horizontal High Voltage Deflection Drive...
  • Page 20 Troubleshooting charts H/D1 Check 200VA to PA14M. To No Power Horizontal Drive B+ to R481 is 90V 5Vp-p H Drive signal is output to Source of Q423. 60Hz 200Vp-p 5Vp-p 31.5 / 33.75KHz The voltage waveform of Q425's Collector is the following. If the impedance value of Q425's collector is near zero Ω, the horizontal deflection TR (Q425) is dead.
  • Page 21 Troubleshooting charts HVD1 High Voltage Drive signal is output High Voltage Drive signal is output Check 200VB to to pin 3 of I401. to source of Q407. PA14M. 12Vp-p 200Vp-p To No Power 31.5 / 33.75KHz 31.5 / 33.75KHz FBT B+ to #12 of PW16P is about Check EHT Drive signal to base of Q808.

  • Page 22: Vertical Deflection

    Troubleshooting charts Vertical Deflection Vertical SAW waveform is to pin 8 of I412. Check I412. 2.2Vp-p 60Hz The following waveform is to pin 1 of I412. Check vertical deflection circuits around I412. 3.5Vp-p Vertical deflection waveform is to pin 5 of I412. Check vertical deflection circuits around I412.
  • Page 23 Troubleshooting charts No Power (Standby Power : I801) The Standby LED doesn't light up red. Check if F801 is open. Approximately 150VDC is to C806. Check D801 (bridge rectifier). The following waveform is to drain of I801. Check the impedance value of between Source and Drain to I801.

  • Page 24: No Power

    Troubleshooting charts No Power Switch relay (Y802) doesn't operate. F801 short-circuits. Replace F801. Bridge rectifier (D805) short-circuits. (The voltage of between Anode and Cathode to Replace D805. D805 is 0.6V). Both AC lines of power cord don't short-circuit. Replace the parts caused a short-circuit. PWR SW of PW15 is High.
  • Page 25 Troubleshooting charts NO Power Switch relay operation (Y802) is OK. Check the parts caused a short- Replace defective parts with circuit to secondary circuits. a new one. R802 is OK. ReplaceR802. Supply 200VA to PW14. Replace R807 or R852. R807 and R852 are OK. Replace Q801, D810.

  • Page 26: Parts List

    9. Part List (DSC-34W70N) The shaded areas in the schematic diagram and the parts list have especial characteristics important for safety and should be “ ” replaced only with types identical to those in the original circuit or specified in the part list. Before replacing any of those components, read carefully the PRODUCT SAFETY NOTICE on this manual.
  • Page 27 Part List (DSC-34W70N) FT802 7128301212 SCREW TAPPING T2S WAS 3X12 MFZN BK R838 DJ503P51D- POSISTOR J5 03 P5 1D030Q 140 ® F801 5F1CD6321M FUSE UL/CSANM 6.3A 125V R897 RS02Z124J- R M-OXIDE FILM 2W 120K OHM J ® I801 1T0P224Y-- IC AUDIO POWER...
  • Page 28 Part List (DSC-34W70N) E805 4856310600 EYE LET BSR T0.2 (R2.3) E858 4856310600 EYE LET BSR T0.2 (R2.3) E806 4856310600 EYE LET BSR T0.2 (R2.3) E859 4856310600 EYE LET BSR T0.2 (R2.3) E807 4856310600 EYE LET BSR T0.2 (R2.3) E860 4856310600 EYE LET BSR T0.2 (R2.3)
  • Page 29 Part List (DSC-34W70N) C807 CMXB1H104J C MYLAR 50V EU 0.1MF J (TP) ® Q805 T2SA1544-- 2SA1544 C808 CEXF1E470V C ELECTRO 25V RSS 47MF (5X11) TP ® Q806 T2SA1544-- 2SA1544 C813 CEXF2A100V C ELECTRO 100V RSS 10MF (6.3X11) TP Q807 TKTC3198Y-...
  • Page 30 Part List (DSC-34W70N) J812 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R811 RD-2Z273J- R CARBON FILM 1/2 27K OHM J J813 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R812 RD-4Z182J- R CARBON FILM 1/4 1.8K OHM J J814 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 31 Part List (DSC-34W70N) R883 RD-4Z102J- R CARBON FILM 1/4 1K OHM J XV04 5XE20R250E CRYSTAL QUARTZ HC-49/U 20.2500MHZ 30PPM R884 RD-4Z229J- R CARBON FILM 1/4 2.2 OHM J ZZ200 PEVDJ2D013 PCB VIDEO CHIP B AS DSC-3670W R885 RD-4Z229J- R CARBON FILM 1/4 2.2 OHM J...
  • Page 32 Part List (DSC-34W70N) CC210 HCBD684KBA C CHIP CERA 10V X7R 0.68MF K 1608 CC300 HCBH104KBA C CHIP CERA 25V X7R 0.1MF K 1608 CC211 HCBK683KBA C CHIP CERA X7R 50V 0.068MF K 1608 CC303 HCBH104KBA C CHIP CERA 25V X7R 0.1MF K 1608...
  • Page 33 Part List (DSC-34W70N) QC108 T2SA1037KB TR CHIP 2SA1037K-T146-R RC160 HRFT223JBA R CHIP 1/10 22K OHM J 1608 QC109 T2SC2412KB TR CHIP 2SC2412K-T146-BR RC167 HRFT221JBA R CHIP 1/10 220 OHM J 1608 QC110 T2SC2412KB TR CHIP 2SC2412K-T146-BR RC168 HRFT221JBA R CHIP...
  • Page 34 Part List (DSC-34W70N) CC117 HCBD105KBA C CHIP CERA 10V X7R 1MF K 1608 CC218 HCBK152KBA C CHIP CERA 50V X7R 1500PF K 1608 CC119 HCEJF100MC C ELECTRO CHIP 16V 10MF MV 4052 CC220 HCFF224ZBA C CHIP CERA 16V Y5V 0.22MF Z 1608...
  • Page 35 Part List (DSC-34W70N) LC106 HFFH1H500B F CHIP FERRITE BEAD HB-1H3216-500JT UC108 1HC4538SJD IC CHIP HC4538SJ LC107 HFLK5225-C F CHIP LPF H354LAI-K5225=P3 UC109 1CXA1315MD IC CHIP D/A CXA1315M LC112 HLC339K02B L CHIP COIL 3.3UH MLF 1608 ZZ250 PEASSWD017 A/V SW AS...
  • Page 36 Part List (DSC-34W70N) DCA03 DBAV99L—B DIODE CHIP BAV99L RCA26 HRFT102JBA R CHIP 1/10 1K OHM J 1608 DCA04 DBAV99L—B DIODE CHIP BAV99L RCA27 HRFT102JBA R CHIP 1/10 1K OHM J 1608 DCA05 DBAV99L—B DIODE CHIP BAV99L RCA28 HRFT332JBA R CHIP 1/10 3.3K OHM J 1608...
  • Page 37 Part List (DSC-34W70N) RCA80 HRFT473JBA R CHIP 1/10 47K OHM J 1608 C500 CEXF2E100V C ELECTRO 250V RSS 10MF (10X20) TP RCA81 HRFT473JBA R CHIP 1/10 47K OHM J 1608 C520 CCYE3D103P C CERA 2KV E 0.01MF P RCA82 HRFT223JBA...
  • Page 38 Part List (DSC-34W70N) C537 CXCH1H100D C CERA 50V CH 10PF D (TAPPING) ® Q506 T2SC4793— 2SC4793 C553 CEXF1C101C C ELECTRO 16V RUS 100MF (6.3X11) TP Q506A 4857027802 HEAT SINK AL EX C605 CMXM2A104J C MYLAR 100V 0.1MF J (TP) Q506B...
  • Page 39 Part List (DSC-34W70N) JU02 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R500 RD-AZ222J- R CARBON FILM 1/6 2.2K OHM J JU03 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING R501 RD-AZ302J- R CARBON FILM 1/6 3K OHM J JU04 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 40 Part List (DSC-34W70N) R609 RD-AZ103J- R CARBON FILM 1/6 10K OHM J M351 4953500100 HOLDER CORD FR HIPS BK R610 RD-AZ152J- R CARBON FILM 1/6 1.5K OHM J M351A 7172401612 SCREW TAPPTITE TT2 TRS 4X16 MFZN BK R611 RD-AZ103J- R CARBON FILM...
  • Page 41 Part List (DSC-34W70N) CC408 HCBK682KBA C CHIP CERA 50V X7R 6800PF K 1608 RC401 HRFT103JBA R CHIP 1/10 10K OHM J 1608 CC409 HCQK391JBA C CHIP CERA 50V CH 390PF J 1608 RC402 HRFT332JBA R CHIP 1/10 3.3K OHM J 1608...
  • Page 42 Part List (DSC-34W70N) RC708 HRFT203JBA R CHIP 1/10 20K OHM J 1608 C489 CEXF1C471C C ELECTRO 16V RUS 470MF (10X12.5)TP RC709 HRFT472JBA R CHIP 1/10 4.7K OHM J 1608 C493 CEXF1C471C C ELECTRO 16V RUS 470MF (10X12.5)TP RC710 HRFT103JBA R CHIP...
  • Page 43 Part List (DSC-34W70N) R437 RS02Z129J- R M-OXIDE FILM 2W 1.2 OHM J (TAPPING) C472 CEXF1C101C C ELECTRO 16V RUS 100MF (6.3X11) TP R442 RS02Z301J- R M-OXIDE FILM 2W 300 OHM J (TAPPING) C478 CCXB2H102K C CERA 500V B 1000PF K (TAPPING)
  • Page 44 Part List (DSC-34W70N) Q422 TKTA1270Y- KTA1270Y (TP) D703 DUZ5R1BM— DIODE ZENER UZ-5.1BM Q424 TKTC3198Y- KTC3198Y D704 DUZ5R1BM— DIODE ZENER UZ-5.1BM Q426 TKTC3198Y- KTC3198Y D705 D1N4148—- DIODE 1N4148 (TAPPING) Q429 TKTC3198Y- KTC3198Y D706 DUZ5R1BM— DIODE ZENER UZ-5.1BM Q701 TKTC3198Y- KTC3198Y D707 D1N4148—-...
  • Page 45 Part List (DSC-34W70N) J034 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J087 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J035 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J088 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J036 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 46 Part List (DSC-34W70N) J140 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J193 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J141 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J194 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING J142 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING...
  • Page 47 Part List (DSC-34W70N) R441 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R726 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R443 RD-AZ153J- R CARBON FILM 1/6 15K OHM J R727 RD-AZ472J- R CARBON FILM 1/6 4.7K OHM J R445...

  • Page 48: Circuit Diagram 10-1. Power Circuit

    10. Circuit Diagram 10-1. Power Circuit - 47 -...

  • Page 49: Main Circuit

    Circuit Diagram 10-2. Main Circuit - 48 -...

  • Page 50: Audio Circuit

    Circuit Diagram 10-3. Audio Circuit - 49 -...

  • Page 51: D Comb Filter Circuit

    Circuit Diagram 10-4. 3D Comb Filter Circuit - 50 -...

  • Page 52: Main Video Circuit

    Circuit Diagram 10-5. Main Video Circuit - 51 -...

  • Page 53: Sub Video Circuit

    Circuit Diagram 10-6. Sub Video Circuit - 52 -...
  • Page 54 Circuit Diagram 10-7. Scan Rate Converter - 53 -...
  • Page 55 Circuit Diagram 10-8. RGB Processor - 54 -...

  • Page 56: Av Circuit

    Circuit Diagram 10-9. AV Circuit - 55 -...

  • Page 57: Union Circuit

    Circuit Diagram 10-10. Union Circuit - 56 -...

  • Page 58: Signal Flow Diagram

    Circuit Diagram 10-11. Signal Flow Diagram H CAP Cap BL Y main UC100 IC02, IU02 Cap R UC104 Cap G UPD64082 C main Z90356,Z86129 Y main IA02 VPC3230 Cap B Y main C main CAPTION IC MM1232 MAIN VIDEO1 3D COMB-FILTER IA 01 VIDEO CVBS...

  • Page 59: Exploded View

    11. Exploded View - 58 -...

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